/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieScenePlayback.h
Assign the input and output rates that frame times should be interpreted as.
void SetTimeBase ( [FFrameRate](API\Runtime\Core\Misc\FFrameRate) InInputRate, [FFrameRate](API\Runtime\Core\Misc\FFrameRate) InOutputRate, EMovieSceneEvaluationType InputEvaluationType )